Slotting mechanism for screw-machines.



v Patented luna 24, |902. W. S. DAVENPORT. sLoTTlNG MECHANISM FOR SCREW MAcHlNES..

(Application filed May '28, 1900.1

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SLTTING M ECHANISM FOR SCREW MACHINES.

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UNirED STATES PATENT OFFICE.

VILLIAM S. DAVENPORT, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR TO BROWN AND SIIARPE MANUFACTURING COMPANY, OF PROVIDENCE, RHODE ISLAND, A CORPORATION OF RHODE ISLAND.

SLOTTING MECHANISIVI FOR SCREW-MACHINES.

SPECIFICATION forming part of Letters Patent No. |`(03,121, `dated June 24, 1902.

Application led May 28| 1900.

ZO all whom it may concern:

Be it known that LWILLIAM SDAVENPORT, of the city and county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Slotting Mechanism for Screw-Machines; and I do hereby declare the following specification, taken in connection with the accompanying drawings, forming a part of the same, to be a full, clear, and exact description thereof.

The object of the invention is to provide a simple and efficient mechanism for automatically slotting the heads of screws or other articles.

The mechanism embodying the invention may be constructed in the form of an attachment to be applied tothe main machine for forming the screws or other articles, or the mechanism may be arranged in the main frame and form a permanent part of the machine.

The mechanism embodying the invention comprises a slotting device and a carrier for transferring the articles from the position where they are acted upon by the cutting and forming tools of the machine directly to the slotting device. The carrier is provided with a socket which fits over the article and in which the article is supported as it is transferred to the slotting device. The article is broughtinto this socket by bringing the socket into line with the article and then moving the carrier forward, and thus a very small or delicate article may be introduced into the socket without any pressure thereon or injury thereto. After the carrier has received the article it moves directly into position in front of the slotting device and presents said article to said device, after which the article is ejected from the socket preparatory to the slot-tin g of the succeeding article.

The invention may be applied to any form of so-called screw-machines or turretlathes, the particular arrangement and operating connections being varied to suit the particular conditions of each case.

In the accompanying drawings a preferred form of mechanism embodying the invention is shown constructed and arranged as an at- Serial No. 18,212. (No model.)

tachment for use in connection with the ma- 5o chine shown in United States Patent No. 604,306, granted to me May 17, 1898, to which reference may be made for an understanding of the devices for operating the forming and cutting tools and for feeding the stock.

Figure 1 of said drawings is a side elevation of the mechanism embodying the present invention and so much of the machine as is necessary to show the manner of applying said mechanism. Fig. 2 is a plan View of a 6o portion of the mechanism. Fig. 3 is a sectional elevation on the line 3 3, Fig. 2. Figs.

4 and 5 are details of the carrier-operating mechanism.

In explaining the construction and operation of the mechanism shown it will be presumed that the machine is set up or adjusted to form the screw shown in Fig. 2 and that the slotting mechanism is adjusted and timed to take the screw as it is severed from 7o the rod of stock and present said screw to the slotting device,which cuts the slot in its head. The parts are shown in the various views in the position they occupy just previous to the movement of the carrier into a position in line with the screw.

The slotting device shown consists of a rotary saw d, secured to the end of a shaft a, which is mounted in a bearing formed on a bracket A. The saw is constantly rotated 8o from a driving-shaft a2, carrying a pulley a3 and a Worm a4, which engages a Worm-wheel a5, secured to shaft a.

The screws S are transferred from the chuck to the slotting device and presented thereto by a carrier in the form of an arm B, mounted on a rockshaft b, by which it is swung back and forth between the chuck and the slotting device. rlhe arm B has detachably secured to its upper end a plate or` block B', 9o provided with an opening or socket B2 of a size to iit the screw S, theblocks being changed for different sizes of screws. A slot B3 is cut across the block B and extends into the opening or socket B2 for a' purpose to be described. 95 The rearward swinging movement of the carrier is determined by an adjustable stop B4 in the form of a screw mounted on the arm B and arranged to strike `a block B5, secured to the bracket A. By adjusting the stop B4 the socket B2 may be brought into exact register with the slotting device, so that the slot will be accurately centered in the head of the screw. The forward position of the carrier is accurately determined by an adjustable stop B(i in the form of a screw mounted on the arm and arranged to engage a block B7, secured to the bracket C, which supports the carrier and its operating mechanism. The shaft Z) is rocked to carry the arm B forward by aspring, and it will accommodate its movement in this direction to the adjustment of the stop BG. The shaft is returned, however, by the action of a cam, and therefore its backward movement is fixed. A yielding connection, therefore, is made between the shaft b 'and the arm B, which allows any slight movement of the shaft with relation to the arm which may be required because of the adjustment of the stop B4. As shown in Figs. 2 and 3, the arm B is loosely mounted on the shaft b and is connected thereto by means of a yoke b', keyed to the shaft and located in a slot in the end of arm B. The yoke b has two arms b2 and b3, which extend upon opposite sides of a lug b4 on the arm B. The lug b4 is recessed on the side opposite the arm b2, and a spring b5 is mounted in said recess and presses the arm b2 away from said lug. The amount of space between the arm b2 and the lug b4 is regulated by a screw h6, mounted in arm b3 and engaging the lug b4. When the stop B4 strikes the block B5 as the shaft b is rocked, the spring b5 may yield to allow a further movement of the shaft l), if necessary.

A torsional and compression spring c surrounds the shaft b, one end of said spring being secured to the bearing O, in which said shaft is mounted, and the other end being connected to a collar c, secured to the shaft b. This spring tends to force the shaft longitudinally against an adjustable stop c2 and also to rotate it into position in front of the chuck. The shaft is rocked against the tension of the spring to move the carrier back into line with the slotting device by means of a gear-segment c3, which engages a pinion c4, keyed on the shaft, so that said shaft turns with said pinion while being free to move longitudinally therein. in a bearing C3, formed in the bracket C, and forms the support for the rear end of the shaft ZJ. The pinion is held in position in said bearing between a shoulder C"l and a cap or plug O5, screwed into the end of the bearing and also carrying the stop-screw c2. The segment c3 is formed on a iever c5, pivoted on a stud-cG and carrying a roll cat its opposite end,which rides on a cam cs. The cam c8 is secured to the shaft 69 (shown in the patent referred to) and may be changed in setting up the Inachine for different pieces of work. As shown, the lever c5 is provided with a socket ci to receive a handle for operating the carrier in ad- The pinion is mounted justingl the mechanism for the particular Work to be done.

The shaft b is advanced longitudinally at the proper intervals through a pinion d, which is mounted on a stud d', carried by bracket C, andengages rack-teeth formed on a sleeve d2, mounted on the shaft b and engaging the collar c. The pinion CZ is connected with a bevel-pinion cl3, which is engaged by a segment d4, formed on the end of a lever The lever d5 is pivoted on the stud c6 and carries a roll d6, which rides on a cam 037, detachably secured to the shaft 69. The cams (i7 and cs are so proportioned that the carrier moves down into line with the screw S just before the cuttingeoff tool severs the screw from the rod of stock. The carrier then moves forward, the screwpassing into the socket B2, which supports it after it is severed from the stock. The carrier then swings back into position in front of the saw a, the block B standing just above a supporting and steadying block A2 and the head of the screw S resting against the face of the block and just in front of the saw d. The carrier then advances, forcing the head of the screw against the saw, which cuts a slot therein. The carrier then moves back into the position shown in the drawings and remains in this position until another screw is about to be severed, when the same cycle of movements is repeated. During the backward movement of the carrier the screw is ejected by a fingerf, which passes through the slot BB, before referred to. This finger is secured to an arm A3 of the bracketAand is arranged to lie behind the screw when the carrier brings the screw into position in front of the saw. When the carrier moves back, the finger engages the end of the screw and arrests its movement, so that said screw is ejected and falls through an opening A4 iu bracket A into a chute A5.

In order to enable the slotting device to be adjusted for screws having different lengths of heads, the bracket A is adjustably mounted on a second bracket AG, which is secured to the main frame of the machine. The bracket A is guided on a way A7, Fig. 3, formed on the bracket A6, and is adjusted by means of a screw AS, Fig. l, bolts A9, Fig. 2, being provided for clamping the bracket in its adjusted position.

What I claim as my invention, and desire to secure by Letters Patent, is-

l. In a slotting mechanism for screw-machines, the combination with a slotting device of a carrier having a socket for supporting the article being formed, mechanism for moving the carrier to bring the socket in line with the article, advancing the carrier to bring the article into the socket, moving the carrier directly into position in front of the slotting device, advancing the carrier to bring the article under the action of the slotting device and moving said carrier away from the slotting device, and an ejector acting during the IIO backward movement of the carrier to eject the slotted article.

2. In a slotting mechanism for screw-machines, the combination with a slottin g device, of an oscillating arm, means for oscillating said arm to a position in front of the chuck of the screw-machine, a socket in said arm for supporting the article being formed, means .for advancing said arm to bring the article into the socket, means for swinging said arm directly into position to bring the article in line With the slotting device, means for advancing said arm to feed the article against the slotting device and means for retracting said arm.

3. In a slotting mechanism for screw-machines, the combination With a slotting device, of an oscillating arm, a socket therein for supporting the article being formed, a rock-shaft to which said arm is secured, means for rocking said shaft to swing the arm to a position in front of the chuck of the screwmachine, means for moving said shaft longitudinally when the socket is in line with the article being formed, means for swinging said arm directly into position to bring the article in line with the slotting device, and for advancing and retracting said shaft longitudinally When the socket registers with the slottin g device.

4. In a slotting mechanism for screw-maYY chines, the combination with a slotting device of a carrier, having means for supporting and carrying the article being formed, means for operating said carrier to present an article to the slotting device, means for retracting said carrier, and a stationary finger for ejecting the article from the carrier during its retracting movement.

5. In a slotting mechanism for screw-inachines, the combination With a slotting device of a carrier, having a socket for the article being formed, a slot extending into said socket, an ejector arranged to pass through said slot as the carrier is retracted and means for retracting the carrier.

6. In a slotting mechanism for screw-machines, the combination with a slotting device of an oscillating carrier for presenting the articles being formed to the slottin g device, a rock-shaft to which said carrier is secured a pinion keyed to said shaft, a segment engaging said pinion, a cam for operating said segment, a rack connected with said shaft, a pinion engaging said rack, and a cam connected to operate said pinion.

7. In a slotting mechanism for screw-man chines, the combination With a slotting device of an oscillating carrier for presenting the article being formed to the slotting device, a rock-shaft to which said carrier is secured, means for rocking said shaft, a rack connected with said shaft, a pinion engaging 'said rack, a bevel-pinion connected to said pinion, a lever having a segment engaging said bevel-pinion and a cam for operating said lever.

8. In a slotting mechanism for screw-ma chines,the combination of the carrier B,rock shaft h to which said carrier is secured, spring c acting on said shaft, pinion c4 connected With said shaft, lever c5 having segment c3 engaging pinion c4, cam cs, sleeve d2 on said shaft, pinion d engaging teeth on said sleeve, pinion (Z3 connected With pinion d, lever d5 having segment d4 engaging pinion d3 and cam dl.

9. In a slotting mechanism for screw-machines, the combination With a slotting device, of a swinging carrier having a socket for supporting the article, an adjustable stop for determining the swing of the carrier, a rock-shaft on which said carrier is mounted, a lug on said carrier, a yoke secured to said shaft and having arms straddling said lug and a spring between one of said arms and said lug.

l0. In a slotting mechanism for screwma chines, the combination with a saw a, of a carrier B, having a socket B2 and a slot B3 extending into said socket, an ejector-finger f and a chute A5 into which the articles are discharged by the linger f.

l1. In a slotting mechanism for screw-ma chines, the combination With a slotting device, of a carrier having a socket to receive the article being formed, means for moving said carrier to bring said socket in line with the article in the chuck of the screw-machine, means for advancing said carrier to bring the article into said socket, means for moving said carrier directly to a position to bring the article in line with the slotting device, means for advancing said carrier to feed the article against the slotting device, and means for retracting said carrier.

l2. In a slotting mechanism for screw-machines, the combination with a slotting device, of a carrier having a socket to receive the article being formed, means for moving said carrier to bring said socket in line With the article in the chuck of the screw-machine, means for advancing said carrier to bring the article into said socket, means for moving said carrier directly to a position to bring the article in line with the slotting device, means for advancing said carrier to feed the article against the slotting device, a fixed ejector located in the path of the socket in the retracting movement of said carrier, and means for retracting said carrier and moving it past said fixed ejector from one side thereof to the other.

WILLIAM S. DAVENPORT.

Witnesses:

W. II. THURsroN, J. H. THURs'roN.

ICO 

